US 12,466,957 B2
Rubber-modified bitumen, process for production thereof and use thereof in asphalt
Thomas Klein, Heidelberg (DE); Thomas Rossrucker, Ostringen (DE); Sandra Horstmann, Neuhofen (DE); and Svenja Kusterer, Schwetzingen (DE)
Assigned to LANXESS Deutschland GmbH, Cologne (DE)
Appl. No. 17/630,955
Filed by LANXESS Deutschland GmbH, Cologne (DE)
PCT Filed Jul. 28, 2020, PCT No. PCT/EP2020/071277
§ 371(c)(1), (2) Date Jan. 28, 2022,
PCT Pub. No. WO2021/018892, PCT Pub. Date Feb. 4, 2021.
Claims priority of application No. 19189591 (EP), filed on Aug. 1, 2019.
Prior Publication US 2022/0275211 A1, Sep. 1, 2022
Int. Cl. C08L 95/00 (2006.01); C08K 5/372 (2006.01); C08L 19/00 (2006.01); C09D 5/08 (2006.01); C09D 195/00 (2006.01)
CPC C08L 95/00 (2013.01) [C08K 5/372 (2013.01); C08L 19/00 (2013.01); C09D 5/08 (2013.01); C09D 195/00 (2013.01)] 5 Claims
 
1. Rubber-modified bitumen obtained when
a) vulcanized rubber and 1% to 5% by weight of at least one dialkyl polysulfide of formula (I), based on the amount of vulcanized rubber
R1—Sx—R2  (1),
wherein R1 and R2 may be identical or different and represent a linear or branched C1-C18-alkyl radical and x represents numbers from 3 to 12,
are mixed and heated to temperatures up to 130° C. under mechanical stress,
b) the reaction product from a) is heat treated at 130-150° C. for less than 20 minutes, and
c) the reaction product from b) is mixed with bitumen.